title: Single-rooted maxillary first molar with a single canal: endodontic retreatment.
abstract: This case report presents an unusual root canal system in a maxillary first molar tooth: a single canal in a single root. The endodontic access cavity displayed only 1 canal orifice. This case demonstrated that: 1) clinicians must have adequate knowledge about root canal morphology and its variations; 2) the location and morphology of root canals should be identified radiologically before the root canal treatment; and 3) careful examination of radiographs and the internal anatomy of teeth is essential.
authors.affiliation: Department of Endodontics, School of Dentistry, European University of Madrid, Madrid, Spain.
authors.forename: Francisco
authors.initials: F
authors.lastname: de la Torre
authors.forename: Rafael
authors.initials: R
authors.lastname: Cisneros-Cabello
authors.forename: José Luis
authors.initials: JL
authors.lastname: Aranguren
authors.forename: Roberto
authors.initials: R
authors.lastname: Estévez
authors.forename: Eugenio
authors.initials: E
authors.lastname: Velasco-Ortega
authors.forename: Juan José
authors.initials: JJ
authors.lastname: Segura-Egea
mesh_terms: D003786:Dental Pulp Cavity / Q000033:anatomy & histology* / Q000000981:diagnostic imaging; D019232:Dental Restoration Failure; D005260:Female; D006801:Humans; D008437:Maxilla; D008875:Middle Aged; D008963:Molar / Q000033:anatomy & histology* / Q000000981:diagnostic imaging; D011859:Radiography; D019233:Retreatment; D012390:Root Canal Therapy / Q000379:methods*; D014092:Tooth Root / Q000033:anatomy & histology* / Q000000981:diagnostic imaging; D019553:Tooth, Nonvital